Nonlocal magnon spin transport in NiFe${}_2$O${}_4$ thin films

Abstract

We report magnon spin transport in nickel ferrite (NiFe${}_2$O${}_4$, NFO)/ platinum (Pt) bilayer systems at room temperature. A nonlocal geometry is employed, where the magnons are excited by the spin Hall effect or by the Joule heating induced spin Seebeck effect at the Pt injector, and detected at a certain distance away by the inverse spin Hall effect at the Pt detector. The dependence of the nonlocal magnon spin signals as a function of the magnetic field is closely related to the NFO magnetization behavior. In contrast, we observe that the magnetoresistance measured locally at the Pt injector does not show a clear relation with the average NFO magnetization. We estimate the magnon spin relaxation length to be 3.1 $\pm$ 0.2 $\mu$m in the investigated NFO samples.

6 pages, 4 figures

References in corpus (7)

• Spin Seebeck insulator
• Theory of spin Hall magnetoresistance
• Theory of magnon-driven spin Seebeck effect
• Simultaneous detection of the spin-Hall magnetoresistance and the spin-Seebeck effect in Platinum and Tantalum on Yttrium Iron Garnet
• Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet
• Influence of yttrium iron garnet thickness and heater opacity on the nonlocal transport of electrically and thermally excited magnons
• Sign of inverse spin Hall voltages generated by ferromagnetic resonance and temperature gradients in yttrium iron garnet|platinum bilayers

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• Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect
• Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate
• Antiferromagnetic magnon pseudospin: Dynamics and diffusive transport
• Electrical transport and optical band gap of NiFe${}_{\text{2}}$O${}_{\text{x}}$ thin films
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• Exploiting Coherence in Nonlinear Spin-Superfluid Transport
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• Role of NiO in the nonlocal spin transport through thin NiO films on Y${}_3$Fe${}_5$O${}_{12}$
• Nonlocal magnon spin transport in yttrium iron garnet with tantalum and platinum spin injection/detection electrodes
• Microwave control of thermal magnon spin transport
• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
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